Keystones — Lintel
Five GCSE retrieval questions · 23 September 2019 · mathsvault.uk/keystones
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1. Number Converting to standard form
69000
Answer: 6.9 × 104 -
2. Algebra Factorising monic quadratics
Factorise: x² + x - 2
Answer: (x + 2)(x - 1) -
3. Geometry SOHCAHTOA — missing length
Hypotenuse = 39cm, angle = 45°. Find adjacent side
Answer: 27.6cm -
4. Ratio Mixed ratio problems
Divide 126 in the ratio 1:3:3
Answer: 18, 54 and 54 -
5. Statistics Mean
The mean of 6 numbers is 35. If 5 of them are 15, 25, 27, 41, 32, what is the missing number?
Answer: 70